Proton Drive set the standard for privacy-first cloud storage when it launched. Made by the same Swiss team behind Proton Mail, it is fully end-to-end encrypted and trusted by journalists, activists and security professionals worldwide.
FortressDrive matches Proton Drive's encryption guarantees but is built around a different idea: instead of just being a private drive, it is a private Personal OS that happens to include a drive.
Encryption parity
Both services use end-to-end encryption with keys you control. Both are zero-knowledge. Both publish how their encryption works. For pure file storage, the security level is comparable.
Where FortressDrive goes further
- Built-in AI assistant (o3 + GPT-4o) that can read your documents securely.
- Multi-chain crypto wallet — ETH, BTC, SOL, TRX, BNB.
- AES-256 password vault, no separate subscription required.
- Notes, goals with Gantt, journal with heatmap, finance and debt tracker.
- Crypto payments accepted alongside card and bank transfer.
Where Proton Drive is stronger
- Swiss jurisdiction and a longer track record.
- Native desktop and mobile apps on more platforms.
- Larger free tier (currently 5GB) versus FortressDrive's 1GB.
- Independent third-party security audits dating back years.
Pricing
- Proton Drive Free — 5GB.
- Proton Drive Plus — about $4.99/mo for 200GB.
- FortressDrive FORTRESS — $12/mo for 100GB plus full Personal OS.
- FortressDrive DOMINION — $79/mo for 1TB plus full Personal OS.
Who picks which
Choose Proton Drive if you want pure encrypted storage from a long-established Swiss provider. Choose FortressDrive if you want comparable encryption and a single subscription that replaces your vault, notes app, AI tool, finance tracker and crypto wallet at the same time.